Improvement in door-springs



wl M. KELLE.

Door-Springm NO. 136,923. PatentedMarch8,1873.

AM PHoTou rHasRAPH/c ca me (osaanns moeras) formed by the combination ofthe inclosed of Chicago, in the county of Cook and State "is formedaround an elliptical coiled-wire bulb A is formed a hole, c1, to allowthe air p to pass in and out with difficulty. A small UNITED STATES NPATENT OFFICE.

WILLIAM M. KELLIE, OF CHICAGO, ILLINOIS.

*IMPROVEMENT IN DOOR-SPRINGS.

Specicationforming part of Letters Patent No. 136,923, dated March 1S,1672i.

To all whom it mcy concern:

`Be it known that I, WILLIAM M. KELLIE,

ot' Illinois, have invented a new and usei'ul Improvement inDoor-Spring, 'ot' which the following` is a specification:

Figure lis a detail longitudinal section of my improved door-spring.Fig. 2 is a detail cross-section of the same taken through the line c*x, Fig. l.

Similar letters of reference indicate correspending parts.

My invention has for its object to furnish an improved rubberdoor-spring, which shall be so constructed as to cause the door to closegradually and without slamming. Theinvention ,consists in an improveddoor-spring elliptical coiled-wire spring, having its ends embedded inthe solid end parts of the rubber bulb, with said bulb having a hole inits side, and its solid ends perforated to receive the fastenings, ashereinafter fully described.

A represents an elliptical rubber bulb, which spring, B. The body of thecoiled spring is loose in the cavity, but its ends are embedded in thesolid rubber ends of the bulb A, as shown in Figs. l and 2. In one sideof the ring is raised on the rubber around the hole al on the inside ofthe bulb A, to prevent the wire from closing the said hole. -lhrough thesolid ends of the rubber bulb are formed holes c2, to receive the pieceby which it is connected with the door anddoor-casing.

By this construction, when the door is opened, the bulb A andcoiled-wire spring B will be drawn out or elongated, and the coiledspring B will prevent the bulb A from collapsing, and will thus 'insurethe entrance of the air, which from the diculty with which it isexpelled from the cavity through the small hole c1, will prevent the toorapid contraction of the spring, and thus close the door gradually andwithout slamming.V

Having thus described my invention, I

claim as new and desire to secure by Letters Patent- An improveddoor-spring, formed by the combination of .the inclosed ellipticalcoiled wire spring B, having its ends embedded in the solid end parts ofthe rubber bulb A, with said bulb A having a hole in its side, and itssolid ends perforated to receive the iastenings, substantially as hereinshown and described.

XVILLIAM M. KELLIE.

Vitnesses:

JOHN KELLIE, HERE/[EN LEMKER.

